CN203617926U - Power supply circuit and electronic equipment having same power supply circuit - Google Patents
Power supply circuit and electronic equipment having same power supply circuit Download PDFInfo
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- CN203617926U CN203617926U CN201320669139.6U CN201320669139U CN203617926U CN 203617926 U CN203617926 U CN 203617926U CN 201320669139 U CN201320669139 U CN 201320669139U CN 203617926 U CN203617926 U CN 203617926U
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Abstract
The utility model provides a power supply circuit and electronic equipment having the same power supply circuit. The power supply circuit comprises a rectification circuit, a current-limiting resistor and a quick start module, wherein the current-limiting resistor is connected with a forward output end of the rectification circuit in series. The quick start module has a switch element, a charging resistor, a capacitor and a bias resistor, wherein the first end of the switch element is connected with a near terminal of the current-limiting resistor to the forward output end of the rectification circuit, the second end of the switch element is connected with a near terminal of the current-limiting resistor to a load end, and the first end and the second end are conducted or cut off based on voltage between the first end and a third end as a control end; one end of the charging resistor is connected with the third end of the switch element; one end of the capacitor is connected with another end of the charging resistor, and the other end of the capacitor is grounded; and two ends of the bias resistor are respectively connected with the first end and the third end of the switch element.
Description
Technical field
The utility model relates to a kind of power supply circuits for quick starting load and has the electronic equipment of these power supply circuits, particularly relates to a kind of electronic timer having for the power supply circuits of quick starting load.
Background technology
Conventionally, in the electronic equipment of electronic timer etc. and so on, after power supply circuits convert alternating current to direct current by the rectification circuit such as full-wave rectifying circuit or half-wave rectifying circuit, supply with for example integrated circuit (Integrated circuit, below, referred to as IC) etc. load circuit.If because the electric current from power supply side is excessive, can cause the power consumption of circuit to increase or temperature rise, even can impact IC, so conventionally at the forward output series connection current limliting resistance of the rectification circuit of power supply, to play the effect that prevents the problems referred to above.
Take a kind of power supply circuits of halfwave rectifier of electronic timer as example, as shown in Figure 1, the power supply circuits of this timer comprise AC power AC, rectification circuit (resistance R 3, rectifier diode D1, smoothing capacity C1) and two current-limiting resistance R1, R2 connecting with the forward of the forward output through after rectification circuit, the electric current of AC power AC output is by after rectifier diode D1, smoothing capacity C1 rectification, filtering, supply load is (at this, be for example timing circuit etc.), the size of current of supply load depends on the current-limiting resistance R1 of series connection, the resistance of R2.
Be that customization IC, this customization IC only needs the very short time can be designed to start as required time, to reach the object of quick startup at the included control IC of load circuit.But, sometimes the included control IC of load circuit is that non-customized IC is general purpose I C, general purpose I C refers to the processor moving by reading software program, generally there is several functions or multiple module that can be applicable to various logic circuitry, therefore, conventionally, if because being subject to pining down of several functions or multiple modules to make general purpose I C, for load circuit, can to cause start-up time slower.In this case; in the time of power-on; owing to there being the current-limiting resistance playing a protective role in power supply circuits; if so the voltage of power supply end resistance lower or current-limiting resistance is larger; can make the electric current supplied with to the load circuit of this non-customized general purpose I C etc. lower, cause starting load circuit fast.Particularly, with regard to electronic timer product, when startup, the required time can have influence on the precision of timer.Therefore,, for the high electronic timer of required precision, starting load circuit is one of important means guaranteeing precision fast.
Utility model content
The utility model is to propose in view of the above problems, and the purpose of this utility model is, provides a kind of and has for the power supply circuits of starting load circuit fast and have the electronic equipment of this power supply circuits.
According to a technical scheme of the present utility model, the utility model provides a kind of power supply circuits, for powering to the load, and the current-limiting resistance that comprises rectification circuit and be connected in series with the forward output of rectification circuit.Described power supply circuits also comprise quick startup module, this starts module fast has: switch element, it has three terminals, first end is connected with the terminal of the close described forward output of described current-limiting resistance, the second end is connected with the terminal of the close load end of described current-limiting resistance, based on described first end and as the voltage between the 3rd end of control end, conduction and cut-off between described first end and described the second end; Charging resistor, its one end is connected with the 3rd end of described switch element; Electric capacity, its one end is connected with the other end of described charging resistor, the other end ground connection of described electric capacity; Biasing resistor, its two ends are connected with first end, the 3rd end of described switch element respectively.At this, the current-limiting resistance that described current-limiting resistance both can be equivalent to, also can be equivalent to the current-limiting resistance group being made up of multiple current-limiting resistances.
Preferably, between described charging resistor and described electric capacity, be connected with diode and discharge resistance, the anode of described diode connects with the other end or not being connected the 3rd end of described switch element of described charging resistor, negative electrode connects with one end not being connected with ground of described electric capacity, and the two ends of described discharge resistance are connected with anode, the negative electrode of described diode respectively.
Preferably, described power supply circuits are half-wave rectifying circuit.
Preferably, described switch element is thyristor.More preferably, described thyristor is triode.
According to another technical scheme of the present utility model, the utility model provides a kind of electronic equipment, and it comprises described power supply circuits.
Preferably, described electronic equipment is electronic timer.More preferably, described electronic timer has non-customized control IC.
According to the power supply circuits with quick startup module of the present utility model, even in the time of on/off electronic equipment repeatedly, or, even in the time that the alternating current of AC power AC enters negative half period, the described power supply circuits with quick startup module also can not cause the power consumption increase of circuit or the rising of temperature, more can not damage the element of forming circuit, can stablize, normally realize only in the time starting the power supply of electronic equipment, the larger electric current that load circuit is started is fast provided to load circuit, and in the situation that electronic equipment is worked so that rated power is normal, provide specified operating current to load circuit.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that represents the power supply circuits of electronic timer of the prior art.
Fig. 2 is the circuit diagram that represents the power supply circuits of the electronic timer of an execution mode of the present utility model.
Fig. 3 A is the oscillogram that is illustrated in the concrete example of the electric current of supplying with to load circuit in the situation that quick startup module is not set in power supply circuits.
Fig. 3 B is the oscillogram that is illustrated in the concrete example of the electric current of supplying with to load circuit in the situation that is provided with quick startup module in power supply circuits.
Fig. 4 is the circuit diagram that represents the power supply circuits of the electronic timer of another execution mode of the present utility model.
Embodiment
With reference to accompanying drawing, the execution mode of the power supply circuits to electronic timer of the present utility model is described in detail.Wherein, for convenience of explanation, identical element is marked to identical Reference numeral.
Fig. 2 is the circuit diagram that represents the power supply circuits of the electronic timer of an execution mode of the present utility model.Compared with prior art, these power supply circuits are being provided with a startup module 1 fast with the current-limiting resistance R2 place that is connected on the forward output of AC power AC after rectification circuit.This starts module 1 fast has: triode TR1, and its emitter is connected with the terminal of the close above-mentioned forward output of current-limiting resistance R2, and its collector electrode is connected with the terminal of the close load end of current-limiting resistance R2; Charging resistor R4, its one end is connected with the base stage of triode TR1; Capacitor C 2, its one end is connected with the other end of charging resistor R4, other end ground connection; Biasing resistor R5, its two ends are connected with emitter, the base stage of triode TR1 respectively.In the present embodiment, load circuit is timing circuit, namely has control IC and the peripheral circuit thereof of clocking capability.Wherein, controlling IC is that non-customized IC is general purpose I C, and general purpose I C refers to the processor moving by reading software program.
In the time that AC power AC starts power supply with startup timing circuit, if the voltage between emitter and the base stage of triode TR1 is higher than the threshold voltage that makes triode TR1 conducting, between the emitter of triode TR1 and base stage, form electric current stream, make triode TR1 conducting, thereby formed an impedance very little electric current stream in parallel with current-limiting resistance R2.Thus, AC power AC not via current-limiting resistance R2 but power to timing circuit via triode TR1, has reduced the resistance of the current-limiting resistance of connecting with AC power AC, has increased the electric current of supplying with timing circuit, timing circuit is started fast, carry out timing action.Thus, can shorten significantly the start-up time of timing circuit.
Meanwhile,, charge to capacitor C 2 with speed faster also via BE knot and biasing resistor R5, the charging resistor R4 of emitter and base stage from the electric current of the forward output of the rectification circuit of power supply.Along with the voltage (supply voltage after over commutation, filtering) of the forward output (V point) of the rectification circuit of power supply rises gradually, the voltage of charging to capacitor C 2 also increases, when the voltage of ordering as this V rises to the magnitude of voltage of normal work, order at V voltage stabilization time, capacitor C 2 is fully charged, the voltage of one end being connected with charging resistor R4 of capacitor C 2 is substantially equal to the voltage that V is ordered, now, voltage between emitter and the base stage of triode TR1 becomes lower than the threshold voltage that makes triode TR1 conducting, triode TR1 cut-off.Thus, after timing circuit is activated, AC power AC powers to timing circuit via current-limiting resistance R2, current-limiting resistance R2 supplies with the size of the electric current of timing circuit in conjunction with resistance R 1 restriction, to guarantee the operating current of timing circuit in the time normally working, prevent because overcurrent makes the power consumption of circuit excessive, temperature rise causes as the control IC of timing circuit and peripheral circuit thereof and damages.
Thus, only can realize in the time of power initiation, to the larger electric current that this timing circuit is started is fast provided as the timing circuit of load circuit, and the in the situation that of the normal work of electronic timer, provide specified operating current to timing circuit.
Fig. 3 A, 3B are the oscillograms of the concrete example of the electric current that is illustrated in the situation that quick startup module 1 is not set in power supply circuits and supplies with to the timing circuit as load circuit in the situation that being provided with quick startup module 1.The in the situation that above-mentioned quick startup module 1 not being set in power supply circuits, as shown in Figure 3A, supplying with electric current to timing circuit rises with velocity perturbation more slowly, in the time that the fluctuation of electric current reaches the 5th cycle (t1), this electric current is able to the starting current (for example, required electric current is 2.4mA in the time of the control IC as timing circuit and peripheral circuit startup and regular event) that timing circuit is started.With respect to this, the in the situation that of being provided with above-mentioned quick startup module 1 in power supply circuits, as shown in Figure 3 B, supplying with electric current to timing circuit rises with velocity perturbation faster, in the time that the fluctuation of electric current reaches the 3rd cycle (t2), this electric current has been able to the starting current that timing circuit is started, and compared with the situation of quick startup module 1 is not set, has shortened two cycles start-up time.In Fig. 3 A, 3B, the fluctuation of electric current starts timing circuit respectively in the time reaching the 5th cycle and the 3rd cycle, but the start-up time of timing circuit is according to the specification of equipment of application and difference.The current waveform in the time starting shown in Fig. 3 A, 3B be only concrete example, and non-limiting the utility model also, the utility model comprises all situations that is provided with quick startup module.
Fig. 4 is the circuit diagram that represents the power supply circuits of the electronic timer of another execution mode of the present utility model.These power supply circuits be connected on AC power AC after rectification circuit the current-limiting resistance R2 place of forward output be provided with one and start fast module 2.This starts module 2 fast has: triode TR1, and its emitter is connected with the terminal of the close above-mentioned forward output of current-limiting resistance R2, and its collector electrode is connected with the terminal of the close load end of current-limiting resistance R2; Charging resistor R4, its one end is connected with the base stage of triode TR1; Diode D2, its anode (positive pole) is connected with the other end of charging resistor R4; Capacitor C 2, its one end is connected with the negative electrode (negative pole) of diode D2, other end ground connection; Biasing resistor R5, its two ends are connected with emitter, the base stage of triode TR1 respectively; Discharge resistance R6, its two ends are connected with anode, the negative electrode of diode D2 respectively, in parallel with diode D2.
In the present embodiment, the power supply circuits of this electronic timer are half-wave rectifying circuit.For example, be AC20～264V at the input range of AC power AC, in the process of startup timing circuit, when the alternating current of AC power AC enters negative half period, the voltage drop that V is ordered, and now, capacitor C 2 is because being made the voltage at two ends uprise by charging, if directly the voltage of capacitor C 2 is connected with the base stage of triode TR1, likely because capacitor C 2 causes producing reverse voltage between the base-emitter of triode TR1 via biasing resistor R5 electric discharge, if this reverse voltage is excessive, can cause damaging triode TR1.In the time turn-offing the power supply of electronic timer, the voltage drop that V is ordered, the voltage at capacitor C 2 two ends, via biasing resistor R5 electric discharge, equally likely causes producing between the base-emitter of triode TR1 the reverse voltage that makes to cause this triode TR1 damage.Therefore, in the present embodiment, as mentioned above, preferably, between capacitor C 2 and the base stage of triode TR1, add a diode D2, after capacitor C 2 is charged, prevent that capacitor C 2 from discharging rapidly, and cause producing the problem that makes the reverse voltage that this triode TR1 damages between the base-emitter of triode TR1.If from the input voltage of AC power AC lower or select the very strong triode of anti-pressure ability, shown in Fig. 2, without the above-mentioned diode D2 of use.
But if capacitor C 2 can not be discharged because being provided with diode D2, the voltage at capacitor C 2 two ends is keeping higher value always.In this case, after the power cutoff and while again unlatching, because the voltage at capacitor C 2 two ends is very high, cause triode TR1 to end all the time and cannot conducting, so can not realize the function of quick startup timing circuit.Therefore, in the present embodiment, as mentioned above, in the parallel connection of the two ends of above-mentioned diode D2 a discharge resistance R6 that resistance is very high, the condition of this discharge resistance R6 based on following selected: guarantee can not produce between the base-emitter of triode TR1 the reverse voltage that this triode TR1 is damaged, and, guarantee in the time of the power supply of on/off electronic timer repeatedly, can make capacitor C 2 fully discharge in during power cutoff.In the situation that not using above-mentioned diode D2, also without using this discharge resistance R6.
Thus one, even in the time of on/off electronic timer repeatedly, or, even in the time that the alternating current of AC power AC enters negative half period, above-mentioned quick startup module 2 also can not cause the power consumption increase of circuit or the rising of temperature, more can not damage element, can both stablize, normally play only in the time of power initiation, to the larger electric current that this timing circuit is started is fast provided as the timing circuit of load circuit, and the in the situation that of the normal work of electronic timer, provide the effect of specified operating current to timing circuit.
In the present embodiment, utilize triode TR1 to be used as increasing the switch element of the electric current of supplying with timing circuit in the time starting timing circuit, but be not limited to this, as long as have with the switch element of the function of triode TR1 equivalence and can serve as switch element of the present utility model, for example, also can utilize the thyristor of power field effect transistor etc.
In addition, above-mentioned resistance, diode or electric capacity are not limited to one, can be multiple.
In addition, in the present embodiment, power supply circuits are half-wave rectifying circuit, the power supply circuits with quick startup module of the present utility model be applicable to too full-wave rectifying circuit.
In addition, in the present embodiment, be provided with two current-limiting resistance R1, R2, and above-mentioned quick startup module is only arranged on the two ends of current-limiting resistance R2, but is not limited to this, this current-limiting resistance R2 can be the combination of a resistance or multiple resistance.In the situation that multiple current-limiting resistance is set, above-mentioned quick startup module can be arranged on the two ends of one of them current-limiting resistance, also the two ends of the current-limiting resistance group being formed by all current-limiting resistances can be arranged on, the two ends by the current-limiting resistance group that more than current-limiting resistance forms adjacent in multiple current-limiting resistances can also be arranged on.
In addition, in the present embodiment, power supply circuits are applied to electronic timer, but are not limited to this, and the power supply circuits with quick startup module of the present utility model go for other electronic equipment equally.
It should be noted, the utility model can carry out various execution modes and distortion not departing under the thought of broad sense of the present utility model and the prerequisite of scope.In addition, above-mentioned execution mode is used for illustrating the utility model, but does not limit scope of the present utility model.
Claims (8)
1. power supply circuits, for powering to the load, the current-limiting resistance that comprises rectification circuit and be connected in series with the forward output of rectification circuit, is characterized in that,
Comprise quick startup module,
Described quick startup module has:
Switch element, it has three terminals, first end is connected with the terminal of the close described forward output of described current-limiting resistance, the second end is connected with the terminal of the close load end of described current-limiting resistance, based on described first end and as the voltage between the 3rd end of control end, conduction and cut-off between described first end and described the second end
Charging resistor, its one end is connected with the 3rd end of described switch element,
Electric capacity, its one end is connected with the other end of described charging resistor, the other end ground connection of described electric capacity,
Biasing resistor, its two ends are connected with first end, the 3rd end of described switch element respectively.
2. power supply circuits as claimed in claim 1, is characterized in that,
Between described charging resistor and described electric capacity, be connected with diode and discharge resistance,
Whether the anode of described diode connect with the other end not or not being connected the 3rd end of described switch element of described charging resistor, and negative electrode connects with one end not being connected with ground of described electric capacity,
The two ends of described discharge resistance are connected with anode, the negative electrode of described diode respectively.
3. the power supply circuits as described in claim 1 or 2, is characterized in that,
Described power supply circuits are half-wave rectifying circuit.
4. the power supply circuits as described in claim 1 or 2, is characterized in that,
Described switch element is thyristor.
5. power supply circuits as claimed in claim 4, is characterized in that,
Described thyristor is triode.
6. an electronic equipment, is characterized in that,
Comprise the power supply circuits as described in any one in claim 1～5.
7. electronic equipment as claimed in claim 6, is characterized in that,
Described electronic equipment is electronic timer.
8. electronic equipment as claimed in claim 7, is characterized in that,
Described electronic timer has non-customized control IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320669139.6U CN203617926U (en) | 2013-10-28 | 2013-10-28 | Power supply circuit and electronic equipment having same power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320669139.6U CN203617926U (en) | 2013-10-28 | 2013-10-28 | Power supply circuit and electronic equipment having same power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203617926U true CN203617926U (en) | 2014-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320669139.6U Withdrawn - After Issue CN203617926U (en) | 2013-10-28 | 2013-10-28 | Power supply circuit and electronic equipment having same power supply circuit |
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| CN (1) | CN203617926U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578840A (en) * | 2013-10-28 | 2015-04-29 | 欧姆龙株式会社 | Power supply circuit and electronic equipment with same |
-
2013
- 2013-10-28 CN CN201320669139.6U patent/CN203617926U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578840A (en) * | 2013-10-28 | 2015-04-29 | 欧姆龙株式会社 | Power supply circuit and electronic equipment with same |
| CN104578840B (en) * | 2013-10-28 | 2018-04-27 | 欧姆龙株式会社 | Power supply circuit and the electronic equipment with the power supply circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140528 Effective date of abandoning: 20180427 |
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| AV01 | Patent right actively abandoned |