CN201282420Y - HF switch power supply device - Google Patents
HF switch power supply device Download PDFInfo
- Publication number
- CN201282420Y CN201282420Y CNU2008201597946U CN200820159794U CN201282420Y CN 201282420 Y CN201282420 Y CN 201282420Y CN U2008201597946 U CNU2008201597946 U CN U2008201597946U CN 200820159794 U CN200820159794 U CN 200820159794U CN 201282420 Y CN201282420 Y CN 201282420Y
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- circuit
- temperature
- diode
- high frequency
- protection
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Abstract
An HF switching power supply device comprises an input EMI filter circuit, an input rectify filter circuit and an HF voltage transformation circuit, wherein, the secondary side of the transformer in the HF voltage transformation circuit is connected with an output rectify filter circuit, and the primary side thereof is connected with one end of an MOS switch tube; the other end of the MOS switch tube is connected with the output foot of a PWM control circuit; the protection foot of the PWM control circuit is connected with a temperature protection circuit which comprises a resistor, a diode and a temperature relay; one end of the resistor is connected to a power supply, the other end thereof is connected with the positive pole of the diode and the traveling contact of the temperature relay; the negative pole of the diode is connected with the protection foot of the PWM control circuit; and the stationary contact of the temperature relay is earthed. The utility model has the advantages that the components and parts of the temperature guard circuit are reduced; the circuit is simple; the cost is low; the reliability is high; and the HF switching power supply device is provided with a recovery function.
Description
Technical field
The utility model relates to switching power unit, particularly with the high frequency switch power device of temperature protection.
Background technology
The temperature protection circuit that is applied at present on the high frequency switch power device mainly adopts software control.The temperature protection circuit of software control is powerful, and design temperature is protected point arbitrarily, but the circuit complexity, required components and parts are many, the cost height, and reliability is low.
The content of utility model
The utility model provides a kind of high frequency switch power device with hardware controls type temperature protection circuit at the above-mentioned deficiency of existing high frequency switch power device.Its circuit is simple, and required component number is few, and cost is low, the reliability height, but and have a restore funcitons.
The technical solution of the utility model is as follows:
The high frequency switch power device; comprise input EMI (electromagnetic interference) filter circuit, input rectifying filter circuit, the high frequency transforming circuit that are linked in sequence; the secondary of transformer connects output rectifier and filter in the described high frequency transforming circuit; its former limit connects an end of MOS switching tube; the other end of MOS switching tube is connected with the output pin of PWM (pulse-width modulation) control circuit, and the protection pin of described pwm control circuit is connected with temperature protection circuit.
Described temperature protection circuit is connected to form by resistance, diode and temperature relay.One termination power of described resistance, the other end are connected with the positive pole of described diode and the moving contact of temperature relay respectively, and the negative pole of described diode connects the protection pin of PWM controller, the fixed contact ground connection of described temperature relay.
Useful technique effect of the present utility model is:
The utility model has hardware controls type temperature protection circuit, can protect supply unit, and components and parts are considerably less, has only 1 resistance, and 1 diode adds a temperature relay, and circuit is simple, and is with low cost, the reliability height, but and have a restore funcitons.
Description of drawings
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is that temperature protection circuit of the present utility model is implemented illustration.
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
Fig. 1 is a theory diagram of the present utility model.
As shown in Figure 1; the high frequency switch power device; comprise the input EMI filter circuit, input rectifying filter circuit, the high frequency transforming circuit that are linked in sequence; the secondary of transformer connects output rectifier and filter in the described high frequency transforming circuit; its former limit connects an end of MOS switching tube; the other end of MOS switching tube is connected with the output pin of pwm control circuit, and the protection pin of described pwm control circuit is connected with temperature protection circuit.
Electric main 220Vac carries out filtering (anti-electromagnetic interference effect) through input EMI filter circuit earlier, then process input rectifying filter circuit converts to ac commercial power voltage 220Vac about direct voltage 220 * 1.4=308Vdc and carries out filtering (the filter capacitor capacity is big more, and effect is good more); The output pin of PWM controller has high-frequency impulse output, and driven MOS switching tube, MOS switching tube are connected in series with the former limit of high frequency transformer and form the major loop passage; The energy of transformer secondary induction is by the specified direct voltage of final output behind the output rectifier and filter.
Fig. 2 is that temperature protection circuit of the present utility model is implemented illustration.
As shown in Figure 2, the temperature protection circuit in the utility model is the hardware controls type, and it is made up of 20K resistance R 1,1N4148 diode D1 and temperature relay TPR1.One termination power VCC of resistance R 1, the other end are connected with the positive pole of diode D1 and the moving contact a point of temperature relay TPR1 respectively, and the negative pole of diode D1 connects the protection pin of PWM controller, the fixed contact b point ground connection of temperature relay TPR1.
Temperature relay TPR1 is a normally off, and just default conditions are a point and the conducting of b point.The temperature of sensing as TPR1 is during less than the nominal temperature of TPR1, because 2 conductings of a, b, electric current flows to signal ground (without diode) from R1 through TPR1, and the protection pin of PWM controller does not collect signal, so power supply output is normal.The temperature of sensing as TPR1 is during more than or equal to the nominal temperature of TPR1; the a point of TPR1 and b point disconnect; this moment, electric current flowed to the protection pin of PWM controller through D1 from R1; after the protection pin of PWM controller receives guard signal; the PWM controller transfers sleep state to from operating state, and the output pin of controller does not have output waveform, thereby the MOS switching tube is not worked; final major loop is not worked yet, and has realized temperature protection.But the temperature of sensing as TPR1 is during less than recovery temperature, and a point of TPR1 links to each other with the b point again, and electric current flows to signal ground from R1 through TPR1 again, and power supply output transfers to normal again.So this temperature protection circuit is recoverable.
Claims (2)
1. high frequency switch power device; comprise the input EMI filter circuit, input rectifying filter circuit, the high frequency transforming circuit that are linked in sequence; the secondary of transformer connects output rectifier and filter in the described high frequency transforming circuit; its former limit connects an end of MOS switching tube; the other end of MOS switching tube is connected with the output pin of pwm control circuit, it is characterized in that: the protection pin of described pwm control circuit is connected with temperature protection circuit.
2. high frequency switch power device as claimed in claim 1; it is characterized in that: described temperature protection circuit is connected to form by resistance, diode and temperature relay; one termination power of described resistance; the other end is connected with the positive pole of described diode and the moving contact of temperature relay respectively; the negative pole of described diode connects the protection pin of PWM controller, the fixed contact ground connection of described temperature relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201597946U CN201282420Y (en) | 2008-10-28 | 2008-10-28 | HF switch power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201597946U CN201282420Y (en) | 2008-10-28 | 2008-10-28 | HF switch power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201282420Y true CN201282420Y (en) | 2009-07-29 |
Family
ID=40929286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201597946U Expired - Fee Related CN201282420Y (en) | 2008-10-28 | 2008-10-28 | HF switch power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201282420Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507028A (en) * | 2011-10-28 | 2012-06-20 | 江苏省电力公司大丰市供电公司 | Temperature monitoring device for high-frequency switching power supply |
| WO2012113341A1 (en) * | 2011-02-25 | 2012-08-30 | 林耀 | Led constant current drive circuit |
| CN101715265B (en) * | 2009-12-14 | 2013-08-14 | 海洋王照明科技股份有限公司 | LED driving power supply control circuit and LED lamp by using same |
| CN104768270A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Synchronous shutdown LED boost driving circuit |
-
2008
- 2008-10-28 CN CNU2008201597946U patent/CN201282420Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101715265B (en) * | 2009-12-14 | 2013-08-14 | 海洋王照明科技股份有限公司 | LED driving power supply control circuit and LED lamp by using same |
| WO2012113341A1 (en) * | 2011-02-25 | 2012-08-30 | 林耀 | Led constant current drive circuit |
| CN102507028A (en) * | 2011-10-28 | 2012-06-20 | 江苏省电力公司大丰市供电公司 | Temperature monitoring device for high-frequency switching power supply |
| CN104768270A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Synchronous shutdown LED boost driving circuit |
| CN104768270B (en) * | 2014-01-02 | 2019-04-12 | 深圳市海洋王照明工程有限公司 | Synchronous shutdown LED booster driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090729 Termination date: 20121028 |