CN208939568U - A kind of servo-driver brake transistor and the protection circuit of bridge arm failure short circuit - Google Patents
A kind of servo-driver brake transistor and the protection circuit of bridge arm failure short circuit Download PDFInfo
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- CN208939568U CN208939568U CN201821612291.XU CN201821612291U CN208939568U CN 208939568 U CN208939568 U CN 208939568U CN 201821612291 U CN201821612291 U CN 201821612291U CN 208939568 U CN208939568 U CN 208939568U
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Abstract
The utility model discloses a kind of servo-driver brake transistor and the protection circuits of bridge arm failure short circuit, including the first relay and Hall sensor with normally-closed contact, the normally-closed contact of first relay is connected between the filter capacitor of filter circuit and the brake resistor of braking circuit, Hall sensor is connected between the emitter of the brake transistor of filter capacitor and braking circuit, the first end connection switch power Vcc of the coil of first relay, second end connects at the relay control signal end of control loop, the both ends of the current acquisition signal end electrical connection Hall sensor of control loop.By increasing the first relay and Hall sensor in bussed supply circuit; when failure short circuit occurs for brake transistor or bridge arm in bussed supply circuit; the circuit between bus power supply and brake circuits is disconnected by disconnecting the first relay; to play the role of protecting bussed supply circuit, servo-driver is prevented to be burned out.
Description
Technical field
The utility model relates to servo-driver technical fields, more specifically to a kind of servo-driver brake crystal
Pipe and the protection circuit of bridge arm failure short circuit.
Background technique
Currently, brake transistor nonfunctional short circuit or inverter bridge leg failure short circuit can occur for existing general servo-driver.
When brake transistor nonfunctional short circuit occurs, internal charging resistor and brake resistor will directly be serially connected in bussed supply circuit
In, charging resistor and brake resistor have lasting high current to flow through, and lead to charging resistor and brake resistor persistent fever, and surrounding will produce
Raw high temperature causes servo-driver to be burned out to burn other peripheral components, causes fire what is more.When generation inverter bridge
When arm failure short circuit, internal charging resistor will be directly serially connected in bussed supply circuit, and charging resistor will persistently have high current
It flows through, also results in servo-driver and be burned out.
Utility model content
The purpose of the utility model is to provide a kind of servo-driver brake transistor and the protection electricity of bridge arm failure short circuit
Road solves the short circuit of brake transistor nonfunctional or bridge arm failure short circuit and makes charging resistor and brake resistor persistent fever, causes to watch
Take the problem of driver is burned out.
In order to achieve the above objectives, the solution of the utility model is:
A kind of servo-driver brake transistor and the protection circuit of bridge arm failure short circuit, are connected to filter circuit and brake
Between circuit, and with control loop is two-way is electrically connected, including the first relay and Hall sensor with normally-closed contact, first
The normally-closed contact of relay is connected between the filter capacitor of the filter circuit and the brake resistor of the braking circuit, described
Hall sensor is connected between the emitter of the brake transistor of the filter capacitor and the braking circuit, also, described
The first end connection switch power Vcc of the coil of first relay, second end connect the relay control letter of the control loop
At number end, and the current acquisition signal end of the control loop connects the both ends of the Hall sensor.
After adopting the above structure, the utility model has the following beneficial effects: by increasing by bussed supply circuit
One relay and Hall sensor detect the electric current on bussed supply circuit through Hall sensor by control loop,
When failure short circuit occurs for brake transistor in bussed supply circuit or bridge arm, can disconnect bus power supply and brake circuits it
Between circuit, with play the role of protect bussed supply circuit, prevent servo-driver to be burned out.
When brake transistor nonfunctional short circuit when, the rectified bridge of electric current of grid side input, which is output to, in bussed supply circuit fills
Resistance, then it is flow to brake resistor through the first relay normally closed contact, brake transistor is because of failure short circuit, so that electric current directly connects
Cathode to busbar voltage returns to input side power grid using Hall sensor and rectifier bridge, and control loop passes through Hall at this time
Sensor detects current value judgement brake transistor nonfunctional short circuit, and control loop exports open signal to the first relay, makes
The normally-closed contact for obtaining the first relay disconnects, so that the current loop between charging resistor and brake resistor is disconnected, to avoid filling
Resistance and brake resistor persistent fever and the circuit components for burning periphery, so that servo-driver is burned out.
When power crystal tube failure short circuit, the electric current on bussed supply circuit successively passes through charging resistor, the first relay
Device and power transistor return at input side power grid using Hall sensor and rectifier bridge, and control loop passes through Hall at this time
Sensor detects that current value judges power crystal tube failure short circuit, and control loop exports open signal to the first relay, makes
The normally-closed contact for obtaining the first relay disconnects, so that the circuit between charging resistor and brake resistor is disconnected, to avoid charging electricity
Resistance and brake resistor persistent fever and burn the circuit components on periphery so that servo-driver is burned out.
Detailed description of the invention
Fig. 1 is schematic block circuit diagram of the utility model on servo-driver.
Fig. 2 is application circuit of the utility model on servo-driver.
Fig. 3 be the utility model brake in servo-driver transistor nonfunctional it is short-circuit after electric current flow through schematic diagram.
Fig. 4 is that electric current of the utility model after the failure short circuit of servo-driver bridge arm flows through schematic diagram.
Specific embodiment
In order to which the technical solution of the utility model is explained further, below by specific embodiment come to the utility model into
Row elaborates.
A kind of servo-driver brake transistor and the protection circuit of bridge arm failure short circuit, are in conventional servo driver
The improvement made on the basis of bussed supply circuit.
This servo-driver includes control loop and bussed supply circuit, as shown in Figure 1, this bussed supply circuit include according to
Rectification circuit, charging buffer circuit, filter circuit, braking circuit and the inverter circuit of secondary electrical connection, and the output of control loop
End is electrically connected the control terminal of braking circuit and the control terminal of inverter circuit.As shown in Figure 2, wherein rectification circuit includes whole
Bridge is flowed, filter circuit includes filter capacitor C1, and charging buffer circuit includes charging resistor R2 and the second relay RY2, charging electricity
It is connected between rectifier bridge and filter capacitor C1 after resistance R2 is in parallel with the normally opened contact of the second relay RY2.On servo-driver
After electricity, buffers and charge to filter capacitor C1 current limliting through overcharge resistance R2 after the rectified circuit rectifies of three-phase alternating current, it is to be charged
After the completion, control loop allows the second relay RY2 to be attracted by controlling signal, and the second contact relay RY2 is connected, and charges at this time
Resistance R2 is short-circuited, and is no longer worked.
Bussed supply circuit further includes protection circuit, this protects circuit connection between filter circuit and braking circuit, and
Protection circuit with control loop is two-way is electrically connected, it includes the first relay RY1 and Hall with normally-closed contact that this, which protects circuit,
Sensor U1, the normally-closed contact of the first relay RY1 are connected to the brake of the positive terminal and following braking circuits of filter capacitor C1
Between resistance R1, Hall sensor U1 is connected to the negative pole end of filter capacitor C1 and the brake transistor T7 of following braking circuits
Between emitter, also, the first end of the coil of the first relay RY1 is electrically connected with Switching Power Supply Vcc, second end electrical connection control
The relay control signal output end in circuit processed, also, the current acquisition signal end of control loop is electrically connected Hall sensor U1
Both ends.
Further, the first relay RY1 is electrically connected by the first transistor Q2 with control loop, i.e. the first relay
The collector of the second end electrical connection the first transistor Q2 of first coil, the emitter of the first transistor Q2 connect the end GND in RY1,
The relay control signal end of the base stage electrical connection control loop of the first transistor Q2.
Braking circuit includes concatenated brake resistor R1 and brake module Q1, and brake module Q1 includes brake crystal above-mentioned
Pipe T7 and the rectifier diode being connected anti-parallel between the collector and emitter of brake transistor T7.Brake resistor R1 not with
On the positive P (+) of the busbar voltage of brake module Q1 connected one end electric connecting busbar current supply circuit, the hair for the transistor T7 that brakes
On the cathode N (-) of the busbar voltage of emitter-base bandgap grading electric connecting busbar current supply circuit.Inverter circuit is conventional bridge inverter main circuit,
Including six bridge arms, respectively three upper bridge arms and three lower bridge arms, and the power transistors of three upper bridge arms respectively correspond for T1,
T2 and T3, the power transistor of three lower bridge arms respectively corresponds to be constituted U phase with T4 and exports for T4, T5 and T6, power transistor T1,
Power transistor T2 constitutes V phase with T5 and exports, and power transistor T3 constitutes W phase with T6 and exports, the company of power transistor T1 and T4
On contact output terminal to the U phase of motor, on the tie point output terminal to the V phase of motor of power transistor T2 and T5, power
On the tie point output terminal of transistor T3 and T6 to the W phase of motor.And the collector of power transistor T1, T2 and T3 are connected to
On the positive P (+) of the busbar voltage in bussed supply circuit, the emitter of power transistor T4, T5 and T6 are connected to bussed supply
On the cathode N (-) of the busbar voltage in circuit.
In the utility model, the effect of braking circuit is: when the motor in access inverter circuit slows down or stops suddenly
When, in order to avoid excessively high voltage, by opening braking circuit, so that the brake transistor T7 of brake module is connected, stop at this time
Vehicle resistance R1 approximation is serially connected between the positive P (+) of busbar voltage and cathode N (-), and brake resistor R1 is by raised busbar voltage
It consumes, so that busbar voltage be avoided to rise, has the function that protect the component on bussed supply circuit.
In the utility model, protection circuit plays protection to brake transistor T7 failure short circuit and bridge arm failure short circuit
Effect, brake transistor T7 failure short circuit and the bridge arm short-circuit both of these case that fails are described in detail below.
As shown in figure 3, the rectified bridge of electric current of grid side input is output to charging when transistor T7 failure of braking is short-circuit
Resistance R2, then it is flow to brake resistor R1 through the first relay RY1 normally-closed contact, brake transistor T7 is because of failure short circuit, so that electric
Cathode N (-) that stream is directly connected to busbar voltage returns to input side power grid using Hall sensor U1 and rectifier bridge, this time control
Circuit processed detects current value by Hall sensor U1, and whether the transistor T7 that judges to brake fails short circuit, if failure short circuit,
Control loop exports open signal to the first relay RY2, so that the normally-closed contact of the first relay RY2 disconnects, to disconnect
Current loop between charging resistor R2 and brake resistor R1 burns to avoid charging resistor R2 and brake resistor R1 persistent fever
The circuit components on periphery are ruined, so that servo-driver is burned out.
As shown in figure 4, U phase, V phase are identical with the working principle of W phase bridge arm in inverter circuit, it is with the bridge arm of U phase here
Example, when power transistor T1 and T4 fail short circuit, the electric current on bussed supply circuit successively passes through charging resistor R2, first after
Electric appliance RY2, power transistor T1 and T4, return at input side power grid using Hall sensor U1 and rectifier bridge, control at this time
Circuit detects current value by Hall sensor U1, judges that power transistor T1 and T4 failure short circuit, control loop output are opened
Messenger gives the first relay RY2, so that the normally-closed contact of the first relay RY2 disconnects, to disconnect returning for charging resistor R2
Road burns the circuit components on periphery to avoid charging resistor R2 and brake resistor R1 persistent fever, so that servo-driver
It is burned out.
A kind of servo-driver brake transistor of the utility model and the protection circuit of bridge arm failure short circuit, by bus
Increase the first relay and Hall sensor in current supply circuit, by control loop by Hall sensor to bussed supply circuit
On electric current detected, when failure short circuit occurs for brake transistor in bussed supply circuit or bridge arm, mother can be disconnected
Circuit between line power supply and brake circuits, to play the role of protecting bussed supply circuit.
The foregoing is merely the preferred embodiment of the present embodiment, all equalizations done with the utility model claims range
Variation and modification, should belong to the scope of the claims of the utility model.
Claims (1)
1. a kind of servo-driver brake transistor and the protection circuit of bridge arm failure short circuit, it is characterised in that: be connected to filtering
Between circuit and braking circuit, and with control loop is two-way is electrically connected, including the first relay and Hall with normally-closed contact
Sensor, the normally-closed contact of the first relay are connected to the filter capacitor of the filter circuit and the brake electricity of the braking circuit
Between resistance, the Hall sensor be connected to the brake transistor of the filter capacitor and the braking circuit emitter it
Between, also, the first end connection switch power Vcc of the coil of first relay, second end connect the control loop
At relay control signal end, and the current acquisition signal end of the control loop connects the both ends of the Hall sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821612291.XU CN208939568U (en) | 2018-09-29 | 2018-09-29 | A kind of servo-driver brake transistor and the protection circuit of bridge arm failure short circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821612291.XU CN208939568U (en) | 2018-09-29 | 2018-09-29 | A kind of servo-driver brake transistor and the protection circuit of bridge arm failure short circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208939568U true CN208939568U (en) | 2019-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821612291.XU Active CN208939568U (en) | 2018-09-29 | 2018-09-29 | A kind of servo-driver brake transistor and the protection circuit of bridge arm failure short circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN208939568U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021114418A1 (en) * | 2019-12-13 | 2021-06-17 | 浙江禾川科技股份有限公司 | Electric motor drive circuit |
| CN113992111A (en) * | 2021-10-22 | 2022-01-28 | 珠海格力电器股份有限公司 | Dynamic braking circuit of servo driver and servo driver |
-
2018
- 2018-09-29 CN CN201821612291.XU patent/CN208939568U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021114418A1 (en) * | 2019-12-13 | 2021-06-17 | 浙江禾川科技股份有限公司 | Electric motor drive circuit |
| CN113992111A (en) * | 2021-10-22 | 2022-01-28 | 珠海格力电器股份有限公司 | Dynamic braking circuit of servo driver and servo driver |
| CN113992111B (en) * | 2021-10-22 | 2024-04-19 | 珠海格力电器股份有限公司 | Dynamic braking circuit of servo driver and servo driver |
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