CN201247944Y - Chopping voltage-limiting power-supply circuit - Google Patents
Chopping voltage-limiting power-supply circuit Download PDFInfo
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- CN201247944Y CN201247944Y CNU2008200495610U CN200820049561U CN201247944Y CN 201247944 Y CN201247944 Y CN 201247944Y CN U2008200495610 U CNU2008200495610 U CN U2008200495610U CN 200820049561 U CN200820049561 U CN 200820049561U CN 201247944 Y CN201247944 Y CN 201247944Y
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Abstract
The utility model relates to a chopping voltage limiting power supply circuit, the output voltage of which can be controlled into a definite range. The utility model comprises a switching circuit, a rectifying and wave-filtering circuit and a voltage detection circuit, wherein the switching circuit is connected in series with loadings; the input end of the voltage detection circuit is connected with an input power supply, and the output end of the voltage detection circuit is connected with the switching circuit; the switching circuit is a switching electron tube; and the triggering end of the switching circuit is connected with the output end of the voltage detection circuit. The utility model makes the voltage detection circuit placed on the input end of the power supply circuit. Only when the peak value of input voltage is higher than a fixed value, the switching circuit is switched off. Thereby, the utility model protects the DC/DC being not punctured by overvoltage and also protects a switching tube in the power supply circuit being not punctured by overvoltage. The utility model can be applied to a power supply system with an input voltage range ranging between 85 VAC and 500 VAC.
Description
Technical field
The utility model relates to a kind of copped wave pressure limiting power circuit, and its output voltage may command within the specific limits.
Background technology
Traditional power supply overvoltage protection generally is the output voltage that detects power circuit, and it is fed back in the power circuit, when output overvoltage, makes power circuit stop to power to the load.Be CN1592019 for example, open day be that on March 9th, 2005, denomination of invention are in the Chinese invention patent application of " guard method of supply voltage and power circuit thereof ", disclose and adopt the output feedback voltage to carry out the method and the power circuit of overvoltage protection at publication number.In this class power circuit, require the switch mosfet pipe can bear the high-voltage value that brings because of the input voltage overvoltage.
Yet it is 85V～265V AC/DC that prior PWM control switching circuit generally requires input voltage.The power-supply system that adopts the power circuit of above-mentioned overvoltage protection principle can not be applied in this class input voltage higher (when for example voltage is up to 380VAC or 440VAC, 532VDC or 622VDC after the rectification) has suffered.Because in power circuit, in the technology of integrated Switching Power Supply pwm chip the maximum withstand voltage of integrated MOSFET be generally 700V; When chip operation under the inverse-excitation type switch power-supply state, the voltage that bears during the MOSFET off-state be input voltage with anti-swash voltage and, because this magnitude of voltage usually surpasses the withstand voltage of MOSFET, so switching tube is easy to breakdown.
Summary of the invention
The technical problems to be solved in the utility model is, a kind of copped wave pressure limiting power circuit is provided, and when output voltage is no more than set point, makes power circuit not be subject to the overpressure peak influence of alternating current input power supplying and impaired.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of copped wave pressure limiting power circuit, comprise switching circuit, current rectifying and wave filtering circuit and voltage detecting circuit, and it is characterized in that: described switching circuit is connected with load; The input of voltage detecting circuit is connected with the input power supply, and output is connected with switching circuit; When input voltage was in set point, switching circuit only played the conducting effect, when the input voltage overvoltage, and voltage detecting circuit stopcock circuit.The utility model is placed on the input of power circuit with voltage detecting circuit, and only when the input voltage peak value was higher than the value that sets, switching circuit disconnected, and has avoided power circuit influenced by this overpressure peak and impaired.The output waveform that the technical scheme of this pressure limiting is embodied in power circuit is: voltage detecting circuit cuts away the crest voltage that is higher than set definite value with the control switch circuit, and the input voltage that is lower than set definite value then outputs to load through switching circuit, current rectifying and wave filtering circuit.
Described switching circuit is a nomotron, and its trigger end is connected with the output of voltage detecting circuit.
Described voltage detecting circuit comprises voltage sample device and controller; The input of voltage sample device is connected with the input power supply, and output is connected with the input of controller; When input power supply overvoltage that the voltage sample device is gathered, controller conducting and control switch circuit disconnect.
With traditional different according to output feedback copped wave deboost value, the utility model adopts the wave chopping technology scheme of the high voltage peak of pruning: switching circuit and DC/DC load are cascaded, when input voltage is lower than set threshold value, switching circuit only plays the connection effect, when input voltage is higher than threshold value, when being higher than voltage setting value by the crest of wave chopping technology in sine wave, the switching circuit that is connected in the power supply circuits is turn-offed, by rear portion energy-storage travelling wave tube continued power, to realize the pressure limiting requirement.The low-voltage of peak value prune like this through exporting to DC/DC behind the rectifying and wave-filtering, and its magnitude of voltage can not surpass setting voltage copped wave value, thereby protecting DC/DC to make it not in the over-voltage breakdown, also protects the switching tube in the power circuit not to be broken down by high-voltage.The utility model can be applicable to input voltage range in the power-supply system of 85VAC～500VAC.
Description of drawings
Fig. 1 is an electric theory diagram of the present utility model;
Fig. 2 is a circuit diagram of the present utility model;
Fig. 3 is the voltage oscillogram of capacitor C 2 two pins when being input as 380VAC;
Fig. 4 is the voltage wave figure of 2,4 pin of rectifier bridge BR1 when being input as 380V;
Fig. 5 is the DC voltage waveform of the output of capacitor C 2 two ends when being input as 380V;
Fig. 6 is the voltage oscillogram of capacitor C 1 two pins when being input as 220VAC;
Fig. 7 is the voltage wave figure of 2,4 pin of rectifier bridge BR1 when being input as 220V;
Fig. 8 is the DC voltage waveform of the output of capacitor C 2 two ends when being input as 220V.
Embodiment
As shown in Figure 1, the utility model comprises input power supply, voltage detecting circuit, switching circuit, current rectifying and wave filtering circuit, the DC/DC load circuit, and switching circuit, current rectifying and wave filtering circuit are connected with the DC/DC load circuit.In the present embodiment, switching circuit adopts nomotron, and its trigger end is connected with the output of voltage detecting circuit.And voltage detecting circuit comprises voltage sample device and controller; The input of voltage sample device is connected with the input power supply, and output is connected with the input of controller; Controller is connected with switching circuit.When input voltage is in set point, the switching circuit conducting, the controller of voltage detecting circuit does not have signal output, and the input power source voltage is through being added to behind the rectifying and wave-filtering in the load, and the energy-storage travelling wave tube in the current rectifying and wave filtering circuit charges simultaneously.When input power supply overvoltage that the voltage sample device is gathered, the controller conducting of voltage detecting circuit is also exported control signal stopcock circuit, the energy-storage travelling wave tube discharge powering load in the current rectifying and wave filtering circuit.
As shown in Figure 2, voltage detecting circuit comprises fixed resistance R1, Transient Suppression Diode (TVS) D1, photoelectrical coupler OPT1, capacitor C 1.Switching circuit adopts insulated gate polar form power tube (IGBT) Q1, voltage-stabiliser tube D2, and biasing resistor R2, R3.Current rectifying and wave filtering circuit comprises rectifier bridge BR1, rectifier bridge BR2, electrochemical capacitor C2, polarity free capacitor C3; BR1 is the loading section rectification; BR2 is the rectification of copped wave partial circuit; wherein electrochemical capacitor C2 is except that filtering; also as energy-storage travelling wave tube, C3 also plays the effect of dividing potential drop except that can protecting insulated gate polar form power tube (IGBT) Q1.
Operation principle of the present utility model is as follows:
At the input voltage peak value during greater than set point (as Fig. 3), for making rectifier output voltage not exceed the input range value of DC/DC, capacitor C 1 in Fig. 2 plays anti-interference effect, and fixed resistance R1, diode D1 and optical coupler OPT1 play the effect of voltage detecting and voltage stabilizing.When the positive and negative half-wave voltage of input voltage was not higher than the threshold value of diode D1, diode D1, optical coupler OPT1 were in cut-off state, input voltage through rectifier bridge BR2 rectification after resistance R 2 provides trigger voltage to make its conducting to the G of the nomotron Q1 utmost point; Input voltage charges to electrochemical capacitor C2 after rectifier bridge BR1 rectification more then, also powers to load DC/DC simultaneously.Diode D1, optical coupler OPT1 conducting when voltage is higher than the threshold value of diode D1, the secondary conducting of optical coupler OPT1 at this moment, the voltage between the D of nomotron Q1, the S utmost point is reduced to about 0.3V, thereby nomotron Q1 is ended; This moment voltage after capacitor C 3 dividing potential drops again through rectifier bridge BR1 rectification to load DC/DC power supply because capacitor C 3 capacitive reactances are not enough to allow voltage saturation on the electrochemical capacitor C2 more greatly, electrochemical capacitor C2 discharge is powered to load DC/DC.Diode D1, optical coupler OPT1 are ended, input voltage is after rectifier bridge BR2 rectification, provide trigger voltage to make its conducting through resistance R 2 to the G of the nomotron Q1 utmost point, voltage is again after rectifier bridge BR1 rectification, to electrochemical capacitor C2 charging, also power simultaneously to load DC/DC.So circulation.The utility model provides constant voltage to load DC/DC, thereby has protected load DC/DC.Input voltage by switching circuit copped wave after, at the rectification output end of rectifier bridge BR1, voltage waveform is as shown in Figure 4; Again as shown in Figure 5 through filtered VD waveform.
When the input voltage peak value is lower than set point (as Fig. 6), because the whole positive and negative half-wave voltage of input voltage all is lower than the threshold value of diode D1, diode D1, optical coupler OPT1 are in cut-off state always.Voltage provides trigger voltage to make its conducting through resistance R 2 to the G of the nomotron Q1 utmost point after rectifier bridge BR2 rectification, and voltage after rectifier bridge BR1 rectification, to electrochemical capacitor C2 charging, is given load DC/DC power supply more simultaneously.This moment, supply power voltage was equivalent to be directly inputted into load end after the input voltage rectification, and switching circuit only plays the conducting effect, and internal resistance can be ignored.This moment at the waveform of rectifier bridge BR1 output as shown in Figure 7, more as shown in Figure 8 through capacitor C 2 filtered VD waveforms.
Claims (7)
1. a copped wave pressure limiting power circuit comprises switching circuit, current rectifying and wave filtering circuit and voltage detecting circuit, and it is characterized in that: described switching circuit is connected with load; The input of voltage detecting circuit is connected with the input power supply, and output is connected with switching circuit; When input voltage is in set point, the switching circuit conducting, when the input voltage overvoltage, voltage detecting circuit stopcock circuit.
2. copped wave pressure limiting power circuit according to claim 1 is characterized in that: described switching circuit is a nomotron, and its trigger end is connected with the output of voltage detecting circuit.
3. copped wave pressure limiting power circuit according to claim 1 and 2, it is characterized in that: described voltage detecting circuit comprises voltage sample device and controller; The input of voltage sample device is connected with the input power supply, and output is connected with the input of controller; When input power supply overvoltage that the voltage sample device is gathered, controller conducting and control switch circuit disconnect.
4. copped wave pressure limiting power circuit according to claim 3 is characterized in that: described voltage sample device is a voltage stabilizing didoe.
5. copped wave pressure limiting power circuit according to claim 3 is characterized in that: described voltage sample device is a Transient Suppression Diode.
6. copped wave pressure limiting power circuit according to claim 3 is characterized in that: described controller is an optical coupler.
7. copped wave pressure limiting power circuit according to claim 2 is characterized in that: described nomotron is an insulated gate polar form power tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200495610U CN201247944Y (en) | 2008-06-23 | 2008-06-23 | Chopping voltage-limiting power-supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200495610U CN201247944Y (en) | 2008-06-23 | 2008-06-23 | Chopping voltage-limiting power-supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201247944Y true CN201247944Y (en) | 2009-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200495610U Expired - Lifetime CN201247944Y (en) | 2008-06-23 | 2008-06-23 | Chopping voltage-limiting power-supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201247944Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148488A (en) * | 2010-02-09 | 2011-08-10 | 松下电器产业株式会社 | Circuit device |
-
2008
- 2008-06-23 CN CNU2008200495610U patent/CN201247944Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148488A (en) * | 2010-02-09 | 2011-08-10 | 松下电器产业株式会社 | Circuit device |
| CN102148488B (en) * | 2010-02-09 | 2015-04-22 | 松下电器产业株式会社 | Circuit device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090527 |